555 Code Oscillator (CB26324E)

Found in a 1990s Popular Electronics, this circuit produces a tone on a small speaker. The keyer directly controls the power supply.

| Clique na imagem para ampliar |

Mixer with unit gain (CB8758E)
This circuit was found in a 90s Radio Electronics. The integrated circuit admits an equivalent. The...
Intelligent battery charger (CB7130E)
Suggested by Radio Electronics from the 90s, this circuit is suitable for NiCAd batteries with a...
Key Touch Switch (CB16269E)
To control direct current loads, under voltages between 12 and 200 V, and currents up to 3 A, we...